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  1. Spacing and the Retention of Synonyms.Leonard D. Stern & Douglas L. Hintzman - 1979 - Bulletin of the Psychonomic Society 13 (6):363-366.
  • Spacing, Mirror-Image Repetition, and Memory for Pictures.Douglas L. Hintzman & Leonard D. Stern - 1977 - Bulletin of the Psychonomic Society 10 (4):321-324.